Okay so I have been doing alot of sunwell trash lately and I never win ANYTHING...
I usually roll 1-50, which is terrible. But I think I might have solved the problem.
I rolled several times by myself (not in the raid ofc) and its seems that when I roll a high number, I roll a few low rolls afterwards. Then it repeats.
Example (You can also start with low rolls)
89
33
27
98
1
56
3
92
I do this before I go into the raid and roll a few low numbers. Then my first roll in the raid was a 97.
I might add some screen shots later if people want me too 
Hope this helps someone!